Education
She is a graduate of Goddard College, and studied poetry at Vermont College.
She is a graduate of Goddard College, and studied poetry at Vermont College.
Her debut novel, Promise Not to Tell, was published by Harper Paperbacks (an imprint of HarperCollins) in April 2007. Promise Not to Tell was described by Publishers Weekly as "Participant mystery-thriller and part ghost story". lieutenant was released in Germany by Rowohlt Verlag, under the title Das Mädchen im Wald (The Girl in the Woods), in October 2007.
Orion Publishing Group published Promise Not to Tell in the United Kingdom in 2008.
A French edition and Italian edition have also been released. Her follow up suspense novel, Island of Lost Girls was published by Harper Paperbacks in April 2008.
lieutenant was a New York Times Bestseller. lieutenant was released in Germany by Rowohlt Verlag, under the title Die Insel der verlorenen Kinder (The Island of Lost Children).
And in the Netherlands by De Boekerij under the title Het eiland van de verdwenen meisjes (The Island of Missing Girls).
Sphere, an imprint of Little, Brown, published it in the United Kingdom in September 2009. Her next book from HarperCollins, Dismantled, was published in hardcover in June 2009. Dismantled has also been released in the United Kingdom (under the title Girl in the Woods), Germany, and the Netherlands.
In May, 2011, McMahon"s latest suspense novel, Don"t Breathe a Word, was published, again by HarperCollins.
McMahon also has a book of lesbian teen fiction, entitled My Tiki Girl, which was released by Dutton Children"s (an imprint of Penguin Group) in May 2008. lieutenant was included in the American Library Association"s 2009 Rainbow List.